Safety attachment for valves



Patnted Jan. 4,1898.

J. A. GRIFFITHS. SAFETY ATTACHMENT FOR VALVES.

(No Model.)

UNITED STATES PATENT OFFICE,

JAMES A. GRIFFITHS, OF PHILADELPHIA, PENNSYLVANIA.

SAFETY ATTACH M ENT FOR 'VALVES.

SPECIFICATION forming part of Letters Patent No, 596,497, dated January 4, 1898.

Application filed March 23, 1897.

, To all whom, it may concern.-

Be it known that 1, JAMES A. GRIFFITHS, a citizen of the United States, residing at the city of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Safety Attachments for Valves, of which the following is a specification.

My invention has relation to an improvement upon the safety attachment for valves for carbonic-acid-gas or other reservoirs, de scribed and claimed in the Letters Patent No. 583,467, granted to me under date of June 1, 1897, and it relates particularly to the construction and arrangement of such a safety attachment whereby a sudden closure of the main valve will force the gas under compression first to the reservoir, in which it expands prior to acting upon the safety attachment.

The principal object of my invention is to provide a safety attachment for carbonicacidgas or other reservoir valves of simple construction and adapted to be acted upon directly from the reservoir and not from the passage-way leading to the main valve; and to this end my invention consists of the combination, with the reservoir, of a casting adapted to be secured to said reservoir, awide passage or channel located in said casting and communicating with the reservoir, a main valve normally closing said passage or channel, a second passage or channel wholly disconnected from the first passage or channel and located in said casting adjacent to the first passage, but narrower than the same and communicating with the interior of the reservoir, said second passage terminating at a point below said main valve; a diaphragm normally closing the outlet of said second passage, and a removable perforated plug adapted to normally hold the diaphraginin the casting. My invention further consists of a safety attachment for valves constructed and ar- Serial No. 628,831. (No model.)

of a safety attachment for a valve of my invention in one form thereof, and Fig. 2 is a similar view of a modified form of the same.

Referring to the drawings, A is a casing provided internally of the same with a main valve B, having a balland-socket swinging or movable rubber plugseat b, the socketed stem 1) of which valve is partially threaded at b and smooth at Z9 being the upper portion which extends into a stuifing-box 12 in which box are mounted a washer b and a gland b and through which gland and a removable cap I) the said stem extends, the stem 7) being provided at the upper end with a hand- Wheel for operating said stem and thereby the threaded portion of the main valve 13.

a is the combined inlet and outlet passage of the casing. This passage a is an inlet for filling the vessel, cylinder, or reservoir C, which latter is removably secured to the lower end of the valve-casing, and also an outlet for the gas or other elastic fluid in the discharge of the same from said cylinder, vessel, or reservoir 0.

The casing A is provided with an integral projection D, internally of which and extending at substantially a right angle through the same is a passage or channel (1, open at one end when the threaded plug a of the casing A is removed from the cylinder, vessel, or reservoir 0 and closed at the other end by a removable membrane or diaphragm e, mounted within the projection D and held to position against a perforated plug d, the said parts constituting the safety attachment D. The perforation in the plug cl may be of any suitable size. The right-angular passage d, in direct communication with the diaphragm or membrane (2, is located below the main valve and without direct communication with to protect the main valve B, as well as the vessel, cylinder, or reservoir G, to which applied, the safety attachment of the main valve 13 being restored to proper condition 'No. 583,467, above referred to.

again for use by removing the perforated plug d and inserting in said projection D a new diaphragm or membrane 6. For shipping a suitable cap I) is applied to the threaded top 0' of the vessel, cylinder, or reservoir C to protect the casing A, as well as the mainvalve and its accessories. This cap is indicated in dotted outline in Fig. 1 of the drawings.

In Fig. 2 the casing comprises two members A and A, preferably screw-threaded to each other, and in which member A is provided I the right-angular passage or channel d, to cause the diaphragm or membrane 6 to be punctured and the gas or other fluid to escape 5 through the perforations in the plug d, thereby relieving the undue pressure on both the main valve and the vessel, cylinder, or reservoir O, to which the two-part valvecasting is applied, and hence to protect the same against explosions or accidents in transportation of gas or other elastic fluids or in the use thereof, as described in my Letters Patent In addition to this feature the present invention has the advantage, not found in said patentedst-ructure, that upon a sudden closure of the main valve the compressed gas or gas under pres sure is forced through the channel a into the reservoir 0, in which it expands before it enters the passage cl, leading to the diaphragm, and this is so because the passage cl is wholly disconnected from the passage a, and is not, as shown in my Patent No. 583,467, a branch of said passage. 7

Having thus described the nature and ob- In other jects of my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination with a carbonic-acidgas or similar reservoir, of a casting adapted to be'secured to said reservoir, a Wide passage sage or channel and a removable perforated plug adapted to normally hold said diaphragm or membrane insaid casting, substantially as and for the purposes described.

2. The combination with a casting having a right-angular passage, a main valve normally closing said, passage and provided with a rubber seat having a ball-and-socket connection with a stem partially threaded and projecting through a stufling-box havinga washer mounted therein, a gland embracing said stem, a removable cap secured to said casting, a projection provided with a channel closed at one end by a membrane or diaphragm held in position by a detachable centrallyperforated plug and a carbonic-acid-gas or similar reservoir applied to said casting and connected directly with the passage leading to said main valve and also directly with the channel leading to said diaphragm or membrane and said passage and channel wholly disconnected from each other, substantially as and for the purposes described.

In testimony whereof I have hereunto set my signature in the presence of two subscribing witnesses.

JAMES A. GRIFFITHS.

WVitnesses:

J. WALTER DOUGLASS, RICHARD O. MAXWELL. 

